[ 转]Android折叠列表 ExpandableList

本文转自：http://lovezhou.iteye.com/blog/848744

ExpandableList 是折叠列表，通过继承ExpandableListActivity 类就可以非常简单的实现折叠列表。
效果图：


代码实现

package com.zhou.activity;

import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Gravity;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ExpandableListView.ExpandableListContextMenuInfo;

public class ExpandableList extends ExpandableListActivity {
    //声明adapter
    private ExpandableListAdapter mAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //设这标题
        setTitle("可扩展的列表");
        //实例化adapter
        mAdapter = new MyExpandableListAdapter();
        //为列表设置adapter
        setListAdapter(mAdapter);
        //为list注册context菜单
        registerForContextMenu(this.getExpandableListView());
    }


    @Override
    public boolean onChildClick(ExpandableListView parent, View v,
            int groupPosition, int childPosition, long id) {
        Toast.makeText(this, " 组元素索引: " + groupPosition + " 子元素索引: " + childPosition, Toast.LENGTH_SHORT).show();
        return super.onChildClick(parent, v, groupPosition, childPosition, id);
    }


    @Override
    public void onGroupExpand(int groupPosition) {
        Toast.makeText(this, " 组元素索引: " + groupPosition, Toast.LENGTH_SHORT).show();
        super.onGroupExpand(groupPosition);
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        menu.setHeaderTitle("上下文菜单");
        menu.add(0, 0, 0, "单击我");
    }

    // 单击上下文菜单后的逻辑
    @Override
    public boolean onContextItemSelected(MenuItem item) {
        ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();
        String title = ((TextView) info.targetView).getText().toString();

        int type = ExpandableListView.getPackedPositionType(info.packedPosition);
        if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
            int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
            int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);
            Toast.makeText(this, title + " 组元素索引: " + groupPos + " 子元素索引: " + childPos, Toast.LENGTH_SHORT).show();
            return true;
        } else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
            int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
            Toast.makeText(this, title + " 组元素索引: " + groupPos, Toast.LENGTH_SHORT).show();
            return true;
        }
        return false;
    }
    //自定义Adapter
    public class MyExpandableListAdapter extends BaseExpandableListAdapter {
        // 父列表数据
        private String[] groups =
        {
            "吉林省",
            "辽宁省",
            "黑龙江省",
            "山东省"
        };
        // 子列表数据
        private String[][] children =
        {
            { "长春市" },
            { "沈阳市", "铁岭市" },
            { "哈尔滨市", "齐齐哈尔市", "牡丹江市" },
            { "济南市", "青岛市", "淄博市", "潍坊市" }
        };
        @Override
        public Object getChild(int groupPosition, int childPosition) {
            return children[groupPosition][childPosition];
        }
        @Override
        public long getChildId(int groupPosition, int childPosition) {
            return childPosition;
        }
        @Override
        public int getChildrenCount(int groupPosition) {
            return children[groupPosition].length;
        }
        // 取子列表中的某一项的 View
        @Override
        public View getChildView(int groupPosition, int childPosition,
                boolean isLastChild, View convertView, ViewGroup parent) {
            TextView textView = getGenericView();
            textView.setText(getChild(groupPosition, childPosition).toString());
            return textView;
        }
        @Override
        public Object getGroup(int groupPosition) {
            return groups[groupPosition];
        }
        @Override
        public int getGroupCount() {
            return groups.length;
        }
        @Override
        public long getGroupId(int groupPosition) {
            return groupPosition;
        }
        // 取父列表中的某一项的 View
        @Override
        public View getGroupView(int groupPosition, boolean isExpanded,
                View convertView, ViewGroup parent) {
            TextView textView = getGenericView();
            textView.setText(getGroup(groupPosition).toString());
            return textView;
        }
        @Override
        public boolean hasStableIds() {
            return true;
        }
        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return true;
        }
        // 获取某一项的 View 的逻辑
        private TextView getGenericView() {
            AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                    ViewGroup.LayoutParams.FILL_PARENT, 48);
            TextView textView = new TextView(ExpandableList.this);
            textView.setLayoutParams(lp);
            textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
            textView.setPadding(32, 0, 0, 0);
            return textView;
        }
    }
}

package com.zhou.activity;



import android.app.ExpandableListActivity;

import android.os.Bundle;

import android.view.ContextMenu;

import android.view.Gravity;

import android.view.MenuItem;

import android.view.View;

import android.view.ViewGroup;

import android.view.ContextMenu.ContextMenuInfo;

import android.widget.AbsListView;

import android.widget.BaseExpandableListAdapter;

import android.widget.ExpandableListAdapter;

import android.widget.ExpandableListView;

import android.widget.TextView;

import android.widget.Toast;

import android.widget.ExpandableListView.ExpandableListContextMenuInfo;



public class ExpandableList extends ExpandableListActivity {

	//声明adapter

	private ExpandableListAdapter mAdapter;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		//设这标题

		setTitle("可扩展的列表");

		//实例化adapter

		mAdapter = new MyExpandableListAdapter();

		//为列表设置adapter

		setListAdapter(mAdapter);

		//为list注册context菜单

		registerForContextMenu(this.getExpandableListView());

	}

	

	

	@Override

	public boolean onChildClick(ExpandableListView parent, View v,

			int groupPosition, int childPosition, long id) {

		Toast.makeText(this, " 组元素索引: " + groupPosition + " 子元素索引: " + childPosition, Toast.LENGTH_SHORT).show();

		return super.onChildClick(parent, v, groupPosition, childPosition, id);

	}





	@Override

	public void onGroupExpand(int groupPosition) {

		Toast.makeText(this, " 组元素索引: " + groupPosition, Toast.LENGTH_SHORT).show();

		super.onGroupExpand(groupPosition);

	}



	@Override

	public void onCreateContextMenu(ContextMenu menu, View v,

			ContextMenuInfo menuInfo) {

		menu.setHeaderTitle("上下文菜单");

		menu.add(0, 0, 0, "单击我");

	}



	// 单击上下文菜单后的逻辑

	@Override

	public boolean onContextItemSelected(MenuItem item) {

		ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();

		String title = ((TextView) info.targetView).getText().toString();



		int type = ExpandableListView.getPackedPositionType(info.packedPosition);

		if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {

			int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);

			int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);

			Toast.makeText(this, title + " 组元素索引: " + groupPos + " 子元素索引: " + childPos, Toast.LENGTH_SHORT).show();

			return true;

		} else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {

			int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);

			Toast.makeText(this, title + " 组元素索引: " + groupPos, Toast.LENGTH_SHORT).show();

			return true;

		}

		return false;

	}

	//自定义Adapter

	public class MyExpandableListAdapter extends BaseExpandableListAdapter {

		// 父列表数据

		private String[] groups = 

		{ 

			"吉林省", 

			"辽宁省", 

			"黑龙江省",

			"山东省" 

		};

		// 子列表数据

		private String[][] children = 

		{

			{ "长春市" },

			{ "沈阳市", "铁岭市" },

			{ "哈尔滨市", "齐齐哈尔市", "牡丹江市" },

			{ "济南市", "青岛市", "淄博市", "潍坊市" }

		};

		@Override

		public Object getChild(int groupPosition, int childPosition) {

			return children[groupPosition][childPosition];

		}

		@Override

		public long getChildId(int groupPosition, int childPosition) {

			return childPosition;

		}

		@Override

		public int getChildrenCount(int groupPosition) {

			return children[groupPosition].length;

		}

		// 取子列表中的某一项的 View

		@Override

		public View getChildView(int groupPosition, int childPosition,

				boolean isLastChild, View convertView, ViewGroup parent) {

			TextView textView = getGenericView();

			textView.setText(getChild(groupPosition, childPosition).toString());

			return textView;

		}

		@Override

		public Object getGroup(int groupPosition) {

			return groups[groupPosition];

		}

		@Override

		public int getGroupCount() {

			return groups.length;

		}

		@Override

		public long getGroupId(int groupPosition) {

			return groupPosition;

		}

		// 取父列表中的某一项的 View

		@Override

		public View getGroupView(int groupPosition, boolean isExpanded,

				View convertView, ViewGroup parent) {

			TextView textView = getGenericView();

			textView.setText(getGroup(groupPosition).toString());

			return textView;

		}

		@Override

		public boolean hasStableIds() {

			return true;

		}

		@Override

		public boolean isChildSelectable(int groupPosition, int childPosition) {

			return true;

		}

		// 获取某一项的 View 的逻辑

		private TextView getGenericView() {

			AbsListView.LayoutParams lp = new AbsListView.LayoutParams(

					ViewGroup.LayoutParams.FILL_PARENT, 48);

			TextView textView = new TextView(ExpandableList.this);

			textView.setLayoutParams(lp);

			textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);

			textView.setPadding(32, 0, 0, 0);

			return textView;

		}

	}

}

• 
• 大小: 17.2 KB

• ExpandableList.rar (44.9 KB)
• 下载次数: 368